Date: Mon, 12 Dec 2005 11:36:11 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Scott Garfinkle <scotteglist@gmail.com>
Cc: linux-kernel@vger.kernel.org, Matt Mackall <mpm@selenic.com>,
       Andrew Morton <akpm@osdl.org>
Subject: Re: [PATCH 7/15] misc: Make x86 doublefault handling optional
Message-ID: <20051212103611.GA6416@elte.hu>
References: <8.282480653@selenic.com> <200511160713.07632.rob@landley.net> <20051116182145.GP31287@waste.org> <f1079b100511161121g1997cfb4jc8e8aec5072c1d92@mail.gmail.com>
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* Scott Garfinkle <scotteglist@gmail.com> wrote:

> I tend to agree with the spirit of Andi's comment -- disabling this 
> will (I think) make the rare time when it happens into something 
> impossible to debug without a new kernel and reproducing the problem.

in the past couple of years i saw double-faults at a rate of perhaps 
once a year - and i frequently hack lowlevel glue code! So the 
usefulness of this code in the field, and especially on an embedded 
platforms, is extremely limited.

in fact, i've experienced triple-faults (== spontaneous reboots) to be 
at least 10 times more frequent than double-faults! I.e. _if_ your 
kernel (or hardware) is screwed up to the degree that it would 
double-fault, it will much more likely also triple-fault.

IIRC we added the double-fault handler to debug the PAE code originally.  
Now years down the road, making it configurable-out if EMBEDDED makes 
lots of sense.

	Ingo
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